I agree with Gram that one should read the books before going to write a wiki article. But with such Middle-Earth questions as discussed here that would restrict the authors heavely.
From
The History of Middle-Earth; volume 12:
The Peoples of Middle-Earth; part one:
The Prologue and Appendices to The Lord of the Rings; chapter IX:
The Making of Appendix A; sub-chapter (iii):
The House of Eorl; p. 271ff:
Quote:
The second text II was a fair copy of I, with scarcely any change in content other than in detail of dates. Where in I it was said only that Eorl was 'born in the North', in II he was 'born in Irenland in the North'. This name was struck out and replaced by Eotheod, and this is very probably where that name first appeared (it is found also in both texts of the original 'Appendix on Languages', p. 34, $14). It was now further said of Eomer that he 'became a great king and extended his realm west of the Gap of Rohan to the regions between Isen and Greyflood, including Dunland.'
The last text (III) of this period was a finely written manuscript which begins with a brief account of the origin of the Rohirrim in the Men of Eotheod and their southward migration.
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A long note was now appended to Eomer, with the same passage as is found in Appendix A (RK p. 351, footnote) concerning Eowyn, 'Lady of the Shieldarm', and the reference to Meriadoc's name Holdwine given to him by Eomer; and the statement of the extent of his realm appearing in II (p. 271) was rewritten: 'In Eomer's time the realm was extended west beyond the Gap of Rohan as far as the Greyflood and the sea-shores between that river and the Isen, and north to the borders of Lorien, and his men and horses multiplied exceedingly.'
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Okay, 'Enedwaith' isn't mentioned by name, but 'the regions between Greyflood and Isen' is exactly what Enedwaith is.
And the idea was not short living since it made it even through one rewriting. But it is deleted from the final version, so it is for sure uncanonical.
Respectfuly
Findegil